What screening should occur at 28 weeks gestation?

At 28 weeks gestation, screening for diabetes mellitus is a crucial component of prenatal care. This screening typically involves administering a glucose challenge test to identify pregnant individuals who may have developed gestational diabetes, which can pose risks to both the mother and the baby. Early identification of gestational diabetes allows for timely management, which can significantly improve outcomes.

While other screenings such as ultrasound, Rh factor testing, and Group B Streptococcus (GBS) culture are important, they are conducted at different times in pregnancy or have different protocols. Ultrasound for fetal growth may occur earlier in pregnancy based on specific medical indications, Rh factor testing is usually performed during the first trimester and again as needed, and Group B Strep culture is typically performed closer to the end of pregnancy, around 35-37 weeks. Thus, the screening for diabetes mellitus is specifically scheduled for 28 weeks, making it the correct choice.